Source code

/******************************************************************************
 *
 * Copyright (c) 1999-2008 Antillia.com TOSHIYUKI ARAI. ALL RIGHTS RESERVED.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer.
 *  
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 *  MemoryFile.h
 *
 *****************************************************************************/

// SOL++2000
#pragma once

#include <sol\File.h>


namespace SOL {

class MemoryFile :public File {
private:
  HANDLE  hmap;
  char*  buff;
  BOOL  writable;
  int  size;
  
public:
  MemoryFile()
    :File() 
  { 
    hmap     = NULL;
    buff     = NULL;
    writable   = FALSE;
    size    = 0;
      
  }

public:
  BOOL create(const char* name, BOOL writeFlag, int len) 
  {
    writable = writeFlag;
    size     = len;    
    BOOL result = File::create(name);
    if(result) {
      HANDLE fh = getHandle();
        hmap = ::CreateFileMapping(fh, 
              0,
              PAGE_READWRITE,
              0l, 
              size,
              NULL);
      if(hmap) {
        buff = (char*)::MapViewOfFile(hmap, 
                FILE_MAP_WRITE,
                0,
                0,
                size);  
      }
      if(hmap == NULL || buff == NULL) {
         result = FALSE;
      }
    }
    return result;
  }

public:
  ~MemoryFile() 
  {
    close();
  }

public:
  void close()
  {
    if(buff) {
      ::UnmapViewOfFile(hmap);
    }
    if(writable) {
       seek(size, FILE_BEGIN);
    }     
    setEnd();
    File::close();
  }


/*
    MemoryFile();
  ~MemoryFile();
  BOOL  create(const char* name, BOOL writeFlag, int len);
  void  close();
*/
};

}